Propeller.



.No. assmas. PATBNTED APR. 21, 1903.

A.GNA-EGY.

PROPELLER.

APPLICATION I'I-LED NOV. 20, 1906.

1 91 M woes KW Q 7 am'm,

"these arms any preferred number may be UNITED. STATES PA EN OFFICE.

ALBERT GIlAEGY, or CHESTER, ILLINOIS.

' PIROPELLER.

Specification of Letters Patent.

Patented April 21,. 1908.

*Application and November 20, 1906. semi No. 344,311.

To all whom it may concern."

Be it known that I, ALBERT GNAEGY, a

citizen of the United States, residin at Chester, in thecounty ofRandolph an State of Illinois, haveinvented new and useful Improvementsin Propellers, .of which the folowing 1s a specification.

This invention relates generally to pro- 'pellers, and particularly to.that type having shiftable or reversible blades to'facilitate themovement of a vessel in opposite directions.-

The object of the invention is to rovide a propeller. of this characterin W ich -the la es shall be so assembled-with their sup,- porting hubas that their reversal ma in a ready and practical manner be eifectewith a mmimum output of power and the minimum danger of injury in use. a

With the above and other objects in view,

I which will appear as the nature of the inven-l tion is betterunderstood, the same consists in the novel construction and combinationof parts of a pro eller as will behereinafter fully escribed an claimed.

In the accompanying drawings, formin a part of this specification, andin which 11 e characters of reference indicate correspondmg parts,Figure 1 is aview in vertical transverse section throu h a ropellershaft, exhibiting the prope er b ades in elevation. Fig. 2 is a verticallongitudinal section through a portion of the propeller. alverticaltransverse section on an enlarged scale of a portion of the propellershowing more particularl the manner of assembling the blades with t ehub. Fig. 4 is a top plan view of a portion of the pr'o ,eller, showm-more particularly the two positions assume the shaft 1,

,' Rigidly combined in any preferred manner Witl1l3l16 shaft 1 is a-hub4 which/is provided with a plurality of bossesor arms .5 that extend atatangent to the axis of'the'shaft. Of

Fig.3is-

1 designates a he outer faces of the arms are flat to form bearing faces6 against which bear the inner ends of the propeller blades 7- which maybe of, any desired contour. blades is provided with a stud or pin,8thatis adapted to project through an orifice or o ening 9 in the arm 5and is held in position t erein bya washer *9 and a screw 10,, the

latter, as clearly shown in Fig. 3 being seat ed in a threaded openingin the stud. Each propeller blade is further provided with an extension11 that bears upon the arm 5 andis provided with a longitudinal slot 12,through which projects a pin14 carried by theouterortion of the sleeve,as clearly shown in ig. 2, the pin being designed to reciprocate in aslot 13 forme in the hub. The length of the slots '13 is such that whenthe sleeve is shifted longitudinally of the hub to bring the pins 14into engagement with one or the other of the end walls of the slots 13,the desired angular adjustment of the blades will be effected to causethe propeller to drive the vessel either forward or rearward as may bedesired.

provided, three in this instance being shown.

Each of these An advantage arising from the tangentialv 1 disposition ofthe studs 8 relatively to the ma or axis of the shaft 1 is that theproper eccentric throw of the blades may be accurately determined andmaintained whereby high efficiency .of the propeller will be se- 'cured.Further by providing the blades with the studs 8 as asole'means of assemblage with the arms 5 but small labor and expense will attend theremoval of a brokenv blade and its replacement by a new one.

WhatIclaimis: .The combination with a shaft, of a hub rigidly connectedto one end thereof and extendingover'the shaft, and of such diameter asto form arecess between-the hub and the shaft and provided with aplurality of longi tudinally-extending slots, a shiftable sleeveextending in said recess, a plurality of arms formed integral with thehu and extending tan entially with respect to the axis of the sha t,each of'said arms provided with a fiat face and'with anopening, apropeller blade mounted upon each of said arms and formedwith anextension having a flat face to bear upon the like face of the arm witha slot ex- H tending in the direction of the length thereof, the slotsinsaid extensions being arranged at an angle with respect to the slots inthe hub,

a stud'projecting from each of the blades and extending in the openingof the arm and formed with a screw-threaded opening, a washer mountedagainst the lower face of each of the arms, a screw extending throughsaid washer and. engaging in' said screwthreaded opening forloosely'connecting the blade to the arm, and a plurality of pins carriedby the outer end of the sleeve and adapted to extend through the slotsin the hub and engage in the slots of the extensions for ad- 10 justingthe blades to various angles when the sleeve is shifted.

In testimony whereof, I aflix my signature in presence of two witnesses.

ALBERT GNAEGY. Witnesses:

GEORGE W. STALEY, KINNEY S. l\/lCBRII)E.

